[suhb] Informal.
a submarine.
a substitute.
a submarine sandwich. See hero sandwich.
a subcontractor.
a sublieutenant.
a subordinate.
a subaltern.
British. an advance against one's wages, especially one granted as a subsistence allowance.
Photography. a substratum.
verb (used without object), subbed, subbing.
to act as a substitute for another.
verb (used with object), subbed, subbing.
Photography. to coat (a film or plate) with a substratum.

by shortening of words prefixed with sub-

3. See hero sandwich. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sub (sʌb)
1.  subaltern subeditor submarine subordinate subscription substandard substitute See substratum short for several words beginning with sub-
2.  informal (Brit) Formal term: subsistence allowance an advance payment of wages or salary
vb , subs, subbing, subbed
3.  (intr) to serve as a substitute
4.  informal (intr) to act as a substitute (for)
5.  informal (Brit) to grant or receive (an advance payment of wages or salary)
6.  informal (tr) short for subedit
7.  (tr) photog to apply a substratum to (a film or plate base)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

prefix of L. origin meaning "under," from L. preposition sub "under" (also "close to, up to, towards"), from a variant form (*(s)up-, perhaps representing *ex-upo-) of PIE base *upo- "from below," hence "turning upward, upward, up, up from under, over, beyond" (cf. Skt. upa "near, under, up to, on,"
Gk. hypo "under," Goth. iup, O.N., O.E. upp "up, upward," Hittite up-zi "rises"). Used as a prefix and in various combinations. The original meaning is now obscured in many words from Latin (suggest, suspect, subject, etc.); the prefix is active in Mod. Eng., however, sometimes meaning "subordinate" (as in subcontinent, first recorded 1863) or "inferior" (a sense first attested 1963). Many such words are transparent (e.g. subcommittee, 1610) and etymologies of their root words may be found under those headings. As a word of its own, sub is first recorded 1830, as a shortened form of substitute (originally of printer's substitutes). The verb in this sense is from 1853.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sub- pref.

  1. Below; under; beneath: subcutaneous.

  2. Subordinate; secondary: subinfection.

  3. Subdivision: subkingdom.

  4. Less than completely or normally; nearly; almost: subfertility.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
A prefix that means "underneath or lower" (as in subsoil), "a subordinate or secondary part of something else" (as in subphylum.), or "less than completely" (as in subtropical.)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
  1. submarine

  2. substitute

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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